The trend chart gives us information about the mean cost of monthly contract for various cell phones in 2002 starting from January till September, and contracts are measured in euros. Overall Domo has the highest cost, reaching 25 euros in July.
Initially, the Alpha brand had the lowest price 5 euros from January to June, though it went up to 7 euros in April, but in June the price remained 5 euros. In July, the price increased to 10 euros and reached 25 euros in September. The Sim TX and Lex brands have a similar trend through the timespan with a minor difference of 3 euros starting in January at 9 and 12 euros respectively. Even though the price varied from 2 to 3 euros until May, but in June, Sim TX was priced at 14 euros and Lex had around 13 euros. At last, Lex increased to 17 euros, but the Sim TX declined to 8 euros in September.
At the start, the contract price for the Domo was 15 euros in January, and some variations with 2 to 3 euros till April. Then went high in May at 20 euros and the same in June, then rapidly increased to 25 euros and dropped to 23 euros.